1. Diameter: 28mm2. Voltage: 5V3. The step angle: 5.625 x 1/64 4. Speed down ratio: 1/64 5. The 5 line 4 phase can use ordinary ULN2003 chip driver, it can be connected into the 2 phase and matched with the development board use, direct splicing, it is convenient to use stepper motor in the development board